The Yeti VIB 250 Ultralight Down Sleeping Bag with a full length two way zip. The Yeti VIB 250 is made from the finest down quality, designed in a comfortable shape with wide opening zipper. The VIB 250 outer shell is a breathable, insulating, water-repellent fabric very packable. The Ultra Light is made from an absolutely first class, compact and almost impossibly light, quality materials! SupCell, a film thin nylon material that weighs under 30 g/qm, is used fort he tear- and light water resistant exterior shell. This, when combined with the best in pure goose down filling (95/5, 800 cuin Loft) and a special baffle construction, is the secret that makes the warmth-to-weight ratio possible. A quality high tech product designed for duty when every ounce and spare inch counts without compromising comfort.